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The recommendations for daily intake vary between 12-15 mg per day for men or 8-12 mg for women, and the UL (tolerable upper intake) is 40 mg. A low dose zinc supplement should be all that is needed to prevent a deficiency, although up to 30 mg is commonly taken with relative safety.
How much vitamin D should adults take? According to the National Institutes of Health (NIH), the daily Adequate Intake (AI) for adults is 5 mcg (200 IU) daily for males, female, and pregnant/lactating women under the age of 50. People 50 to 70 years old should get 10 mcg daily (400 IU) daily, and those over 70 should get 15 mcg daily (600 IU). Based on recent research, Dr. Weil recommends 2,000 IU of vitamin D per day. Look for supplements that provide D3 (cholecalciferol) rather than D2 (ergocalciferol).